第17章MySQL主从配置
mysql安装总结
- mysql主从准备工做：
- 准备两台机器，每台机器安装msyql服务，并启动mysql服务
- mysql详细安装
1.首先下载二进制免编译的包，下载到/usr/local/src/目录下html
2.解压压缩包mysql
3.解压完以后，把解压出来的目录放到 /usr/local/mysql/ 目录下linux
- 注意点：
- 首先检查 /usr/local/mysql/ 目录是否存在
- 如果这个目录存在，首先把这个目录改个名字，或者把目录下的内容删除
- 而后把解压出来的目录放到 /usr/local/mysql/ 目录下面
- 目录内容应该以下
[root@xuexi-001 ~]# ls /usr/local/mysql bin data include man my-new.cnf README share support-files COPYING docs lib my.cnf mysql-test scripts sql-bench
4.而后切换到 /usr/local/mysql/ 目录下，进行初始化 命令web
- 初始化命令 ./scripts/mysql_install_db --user=mysql --datadir=/data/mysql
- 注意点：
- 其中的--user=mysql 须要提早建立
5.初始化成功的标志就是两个OK，或者用 echo $? 检查是否初始化成功sql
6.编辑 /etc/my.cnf 文件——>默认是自带 my.cnf 文件的数据库
在 /etc/my.cnf 文件中 定义 datadir=/data/mysql 定义 socket=/tmp/mysql.sock
7.拷贝启动脚本vim
- 命令 cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
8.编辑启动脚本bash
vim /etc/init.d/mysqld //对如下两行进行指定路径 指定basedir的路径 /usr/local/mysql 指定datadir的路径 /data/mysql
9.以后就能够启动mysql了服务器
- 命令 /etc/init.d/mysql start
10.若是启动失败，能够去查看错误日志dom
11.建议 ：
- 查看 /data/mysql 目录下的文件，默认属主、属组，若是不是mysql的，启动时会因没法写入数据而不能启动mysql
- 改变属主和属组，命令 chomd mysql:mysql /data/mysql
- 而后就能够尝试启动，命令 /etc/init.d/mysql start
12.若想开机启动，只须要输入命令
- 命令 chkconfig mysqld on
配置主
- 主从配置 - 主上操做
- 安装mysql
- 修改my.cnf，增长server-id=130和log_bin=aminglinux1
- 修改完配置文件后，启动或者重启mysqld服务
- 把mysql库备份并恢复成aming库，做为测试数据
- mysqldump -uroot mysql > /tmp/mysql.sql
- mysql -uroot -e “create database aming”
- mysql -uroot aming < /tmp/mysql.sql
- 建立用做同步数据的用户
- grant replication slave on . to 'repl'@slave_ip identified by 'password';
- flush tables with read lock;
- show master status;
主从配置 - 主上操做
1.在两台机器安装并启动mysql服务后，首先在主上进行操做
2.修改/etc/my.cnf配置文件
- 在配置文件下[mysqld]下添加
- server_id=130 这个id能够自定义，这里根据ip来定义
- log_bin=xuexi1打开binlog，名字自定义为log_bin=xuexi1 最终以下
[root@xuexi-001 ~]# vim /etc/my.cnf # For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [mysqld] server_id = 130 log_bin=xuexi1 # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # These are commonly set, remove the # and set as required. # basedir = ..... # datadir = ..... # port = ..... # server_id = ..... # socket = ..... # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M 保存退出
3.更改完配置文件后，须要重启mysql /etc/init.d/mysqld restart
[root@xuexi-001 ~]# /etc/init.d/mysqld restart Shutting down MySQL.... SUCCESS! Starting MySQL.. SUCCESS!
4.这时候来/data/mysql/目录下，会生成一些文件
- ls -lt /data/mysql/
[root@xuexi-001 ~]# cd /data/mysql/ [root@xuexi-001 mysql]# ls -lt 总用量 110944 -rw-rw---- 1 mysql mysql 50331648 8月 31 22:57 ib_logfile0 -rw-rw---- 1 mysql mysql 12582912 8月 31 22:57 ibdata1 -rw-rw---- 1 mysql mysql 276358 8月 31 22:57 xuexi-001.err -rw-rw---- 1 mysql mysql 5 8月 31 22:57 xuexi-001.pid -rw-rw---- 1 mysql mysql 32 8月 31 22:57 xuexi1.index -rw-rw---- 1 mysql mysql 120 8月 31 22:57 xuexi1.000002 -rw-rw---- 1 mysql mysql 143 8月 31 22:57 xuexi1.000001 drwx------ 2 mysql mysql 324 8月 30 07:56 zrlog drwx------ 2 mysql mysql 4096 7月 25 22:21 mysql2 drwx------ 2 mysql mysql 48 7月 23 00:12 db1 -rw-rw---- 1 mysql mysql 56 7月 3 23:41 auto.cnf drwx------ 2 mysql mysql 4096 7月 3 23:33 mysql drwx------ 2 mysql mysql 4096 7月 3 23:33 performance_schema -rw-rw---- 1 mysql mysql 50331648 7月 3 23:33 ib_logfile1 drwx------ 2 mysql mysql 6 7月 3 23:33 test
- 其中 .index 索引页，这个文件是必需要有的
- 其中 .000001
5.这个是二进制日志文件，会持续生成二、三、4等等（这个文件是实现主从配置的根本，没有这个文件根本没有办法完成主从）
6.测试，准备一个数据作演示用的 首先作一个备份
- mysqldump -uroot -p123456 zrlog > /tmp/zrlog.sql
[root@xuexi-001 ~]# mysqldump -uroot -phanfeng zrlog > /tmp/zrlog.sql Warning: Using a password on the command line interface can be insecure.
7.而后建立一个新的库
- mysql -uroot -p123456 -e "create database xuexi"
[root@xuexi-001 mysql]# mysql -uroot -p123456 -e "create database xuexi" Warning: Using a password on the command line interface can be insecure.
8.建立好库后，还须要把数据恢复一下，那也就是说作的主从，参考的对象就是 xuexi 这个库
- mysql -uroot -p123456 xuexi < /tmp/zrlog.sql
[root@xuexi-001 mysql]# mysql -uroot -p123456 xuexi < /tmp/zrlog.sql Warning: Using a password on the command line interface can be insecure.
9.再来查看/data/mysql/目录下的文件 ls -lt /data/mysql/
[root@xuexi-001 mysql]# ls -lt /data/mysql/ 总用量 225592 -rw-rw---- 1 mysql mysql 50331648 8月 31 23:16 ib_logfile0 -rw-rw---- 1 mysql mysql 79691776 8月 31 23:16 ibdata1 -rw-rw---- 1 mysql mysql 10348 8月 31 23:16 xuexi1.000002 drwx------ 2 mysql mysql 324 8月 31 23:16 xuexi -rw-rw---- 1 mysql mysql 276358 8月 31 22:57 xuexi-001.err -rw-rw---- 1 mysql mysql 5 8月 31 22:57 xuexi-001.pid -rw-rw---- 1 mysql mysql 32 8月 31 22:57 xuexi1.index -rw-rw---- 1 mysql mysql 143 8月 31 22:57 xuexi1.000001 drwx------ 2 mysql mysql 324 8月 30 07:56 zrlog drwx------ 2 mysql mysql 4096 7月 25 22:21 mysql2 drwx------ 2 mysql mysql 48 7月 23 00:12 db1 -rw-rw---- 1 mysql mysql 56 7月 3 23:41 auto.cnf drwx------ 2 mysql mysql 4096 7月 3 23:33 mysql drwx------ 2 mysql mysql 4096 7月 3 23:33 performance_schema -rw-rw---- 1 mysql mysql 50331648 7月 3 23:33 ib_logfile1 drwx------ 2 mysql mysql 6 7月 3 23:33 test
10.能看到xuexi1.000002二进制文件是有增长的，xuexi1.000002增加的大小是和zrlog这个库的保持一致的，xuexi1.000002文件里完整的记录了数据库的建立的库，建立的表，以及表里的内容全都有
11.下面建立用于主从相互同步数据的用户
12.先进入到mysql里面去
- mysql -uroot -p123456
[root@xuexi-001 mysql]# mysql -uroot -p123456 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.6.36-log MySQL Community Server (GPL) Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
13.建立用户
- grant replication slave on . to 'repl'@'192.168.5.130' identified by '234567';
- 指定权限，replication slave权限
- 针对repl这个用户
- 针对 从 的那个IP，指定来源（如果写全部的IP会很危险）
mysql> grant replication slave on *.* to 'repl'@'192.168.5.133' identified by '234567'; Query OK, 0 rows affected (0.00 sec) mysql>
14.锁定表，目的是不让表继续写，由于一会须要作 从 机器配置，须要进行一个同步，让两台机器同步，保证两台机器的数据一致，同步才不会出错
- flush tables with read lock;
mysql> flush tables with read lock; Query OK, 0 rows affected (0.00 sec) mysql>
15.查看一下binlog的文件和大小，并记住binlog的filename
- show master status;
mysql> show master status; +---------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +---------------+----------+--------------+------------------+-------------------+ | xuexi1.000002 | 10558 | | | | +---------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
16.而后退出数据库，作一个数据同步
17.查看/data/mysql/下有哪些库，主上有哪些库，一会从上也得有哪些库，同步这些库，就意味着这些数据都得备份过去
[root@xuexi-001 mysql]# ls auto.cnf ib_logfile1 test xuexi1.000001 db1 mysql xuexi xuexi1.000002 ibdata1 mysql2 xuexi-001.err xuexi1.index ib_logfile0 performance_schema xuexi-001.pid zrlog
18.备份数据库，除了mysql库，由于mysql库里面有帐号密码，从上的时候不可能把全部权限复制过去，因此mysql不须要备份
- 备份其余的库
[root@xuexi-001 mysql]# mysqldump -uroot -p123456 test > /tmp/test.sql Warning: Using a password on the command line interface can be insecure. [root@xuexi-001 mysql]# mysqldump -uroot -p123456 mysql2 > /tmp/mysql2.sql Warning: Using a password on the command line interface can be insecure.
19.等会把/tmp/目录下 .sql文件都拷贝到 从上 去
[root@xuexi-001 mysql]# ls /tmp/*.sql /tmp/mysql2.sql /tmp/test.sql /tmp/zrlog.sql
20.主上操做完成，接下来从上操做
配置从
- 主从配置 - 从上操做
- 安装mysql
- 查看my.cnf，配置server-id=132，要求和主不同
- 修改完配置文件后，启动或者重启mysqld服务
- 把主上aming库同步到从上
- 能够先建立aming库，而后把主上的/tmp/mysql.sql拷贝到从上，而后导入aming库
- mysql -uroot
- stop slave；
- change master to master_host='', master_user='repl', master_password='', master_log_file='', master_log_pos=xx,
- start slave;
- 还要到主上执行 unlock tables
主从配置 - 从上操做
- 在从上机器配置
1.首先在从上安装并启动mysql，而后查看my.cnf，配置server_id=133，要求和主不同，在配置文件的 log_bin参数 就不须要配置的，由于只有 主上 才须要二进制日志文件
[root@xuexi-001 ~]# vim /etc/my.cnf [mysqld] datadir=/data/mysql socket=/tmp/mysql.sock server-id=133 # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Settings user and group are ignored when systemd is used. # If you need to run mysqld under a different user or group, # customize your systemd unit file for mariadb according to the # instructions in http://fedoraproject.org/wiki/Systemd [mysqld_safe] # log-error=/var/log/mariadb/mariadb.log # pid-file=/var/run/mariadb/mariadb.pid # # include all files from the config directory # # !includedir /etc/my.cnf.d join_buffer_size = 128M sort_buffer_size = 2M read_rnd_buffer_size = 2M 保存退出
2.重启mysql服务
[root@xuexi-001 ~]# /etc/init.d/mysqld restart Shutting down MySQL.... SUCCESS! Starting MySQL... SUCCESS!
3.在增长 server-id 后，对于mysql 是没有任何变化的
[root@localhost ~]# ls /data/mysql/ auto.cnf ib_logfile1 mysql ibdata1 localhost.localdomain.err performance_schema ib_logfile0 localhost.localdomain.pid test
4.把主机器上备份的 .sql 数据，拷贝到从机器上，而后作一个数据恢复
- scp 192.168.202.130:/tmp/*.sql /tmp/
- 拷贝数据失败
- 缘由：
- 在拷贝的数据的时候，一直拷贝数据失败，由于在主上的机器里有开机启动脚本，因此致使拷贝数据失败
[root@localhost ~]# scp 192.168.5.130:/tmp/*.sql /tmp/ The authenticity of host '192.168.5.130 (192.168.5.130)' can't be established. ECDSA key fingerprint is SHA256:VuRutO7q299bCFi40MmwIrojehhw6Uv2Z6Wm+QYfp6Q. ECDSA key fingerprint is MD5:80:f0:db:83:55:d0:a5:6b:d8:e6:9a:22:bc:e6:2b:49. Are you sure you want to continue connecting (yes/no)? y Please type 'yes' or 'no': yes Warning: Permanently added '192.168.5.130' (ECDSA) to the list of known hosts. root@192.168.5.130's password: mysql2.sql 100% 643KB 12.6MB/s 00:00 test.sql 100% 1258 236.9KB/s 00:00 zrlog.sql 100% 9869 770.5KB/s 00:00
- 解决方法：
- 将主机器的里的开机启动脚本关闭vi .bashrc配置文件文件中注释掉脚本，再来拷贝数据到从机器上，会发现成功
[root@xuexi-001 ~]# scp 192.168.5.130:/tmp/*.sql /tmp/ The authenticity of host '192.168.5.130 (192.168.5.130)' can't be established. ECDSA key fingerprint is 25:ce:a9:96:36:88:84:ab:4f:7e:80:a3:e7:36:2c:9f. Are you sure you want to continue connecting (yes/no)? yes\ Warning: Permanently added '192.168.202.130' (ECDSA) to the list of known hosts. root@192.168.5.130's password: test.sql 100% 1258 1.2KB/s 00:00 zrlog.sql 100% 10KB 9.8KB/s 00:00
5.进入到从上数据库中——>由于从上没设置密码，因此能够直接进去
[root@xuexi-001 ~]# mysql -uroot -bash: mysql: 未找到命令
- mysql -uroot命令不存在，是由于没有加入到PATH里面
- 这里作个alias别名设置，用单引号' '
[root@xuexi-001 ~]# alias 'mysql=/usr/local/mysql/bin/mysql' [root@xuexi-001 ~]# alias 'mysqldump=/usr/local/mysql/bin/mysqldump'
- 这时候就能够进入到mysql里面去了
[root@xuexi-001 ~]# mysql -uroot Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
6.建立库
- create database zrlog;
- create database test1;
- create database mysql2;
mysql> create database zrlog; Query OK, 1 row affected (0.00 sec) mysql> create database test1; Query OK, 1 row affected (0.00 sec) mysql> create database mysql2; Query OK, 1 row affected (0.00 sec) mysql> quit Bye 退出数据库
7.而后将数据库作一个恢复
- mysql -uroot test1 < /tmp/test.sql
- mysql -uroot zrlog < /tmp/zrlog.sql
- mysql -uroot mysql2 < /tmp/mysql2.sql
[root@localhost ~]# mysql -uroot test1 < /tmp/test.sql [root@localhost ~]# mysql -uroot zrlog < /tmp/zrlog.sql [root@localhost ~]# mysql -uroot mysql2 < /tmp/mysql2.sql
-
保证两边数据一致
-
而后查看/data/mysql/目录下的数据是否和主机器上的/data/mysql/目录是否一致
8.开始实现主从
9.在从机器登陆到mysql
[root@xuexi-001 ~]# mysql -uroot Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 6 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
10.而后在数据库里面执行命令，中止slave
- stop slave;
mysql> stop slave; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql>
11.配置主机器相关配置
- change master to master_host='192.168.5.130', master_user='repl', master_password='234567', master_log_file='xuexi1.000002', master_log_pos=10558;
- master_host='192.168.202.130'，指定主机器host
- master_user='repl'，指定主机器用户
- master_password='hanfeng'，指定主机器密码
- master_log_file='hanfeng1.000001'，指定binlog文件名
- master_log_pos=10549，指定binlog文件大小
- 也能够指定主机器的port，由于在生产环境中，也会有人更改mysql的默认端口 master_port=3306
mysql> change master to master_host='192.168.5.130', master_user='repl', master_password='234567', master_log_file='xuexi1.000002', master_log_pos=10558; Query OK, 0 rows affected, 2 warnings (0.01 sec)
12.开始slave
- start slave;
mysql> start slave; Query OK, 0 rows affected (0.01 sec) mysql>
13.这时候经过 show slave status\G 判断主从是否配置成功
- 查看slave配置
- show slave status\G
- 在G后面不须要加分号，\G自己就是一种结束符
- 看 Slave_IO_Running: Yes 是否为yes
- 看 Slave_SQL_Running: Yes 是否为yes
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.5.130
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: xuexi1.000004
Read_Master_Log_Pos: 120
Relay_Log_File: localhost-relay-bin.000005
Relay_Log_Pos: 280
Relay_Master_Log_File: xuexi1.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 120
Relay_Log_Space: 617
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 130
Master_UUID: 9bace481-7ed7-11e8-98a4-000c29b3a2bf
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
mysql>
14.解锁“主”上的表（在主上机器操做）
- unlock tables;
[root@xuexi-001 ~]# mysql -uroot -p123456 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 2 Server version: 5.6.36-log MySQL Community Server (GPL) Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> unlock tables; Query OK, 0 rows affected (0.00 sec)
15.到这里主从搭建就算完成了
查看主从同步是否正常
- 从上执行mysql -uroot
- show slave stauts\G
- 看是否有
- Slave_IO_Running: Yes
- Slave_SQL_Running: Yes
- 还需关注
- Seconds_Behind_Master: 0 //为主从延迟的时间
- Last_IO_Errno: 0
- Last_IO_Error:
- Last_SQL_Errno: 0
- Last_SQL_Error:
测试主从同步
主服务器上
binlog-do-db= //仅同步指定的库（多个库，能够用“ , ”逗号分隔）——>英文的逗号 ， binlog-ignore-db= //忽略指定库
从服务器上
replicate_do_db= //仅同步指定的库
replicate_ignore_db= //忽略指定库
replicate_do_table= //仅同步指定的表
replicate_ignore_table= //忽略指定表，
- 例如：有一个临时表，写的数据很是快，数据也大，天天都须要删除这时就能够更新删除这个，那么就不须要天天去作同步
replicate_wild_do_table= //如aming.%, 支持通配符% 指定同步靠谱的匹配 同步表
replicate_wild_ignore_table= //如aming.%, 支持通配符% 指定同步靠谱的匹配 忽略表
- 进行从服务器的配置时尽可能使用参数“replicate_wild_”，使匹配更精确，提高使用性能。
测试主从
- 主上 mysql -uroot aming
- select count(*) from db;
- truncate table db;
- 到从上 mysql -uroot aming
- select count(*) from db;
- 主上继续drop table db;
- 从上查看db表
1.在主上机器，进入到mysql
[root@xuexi-001 ~]# mysql -uroot -p123456 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 5562 Server version: 5.6.35-log MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
2.进入到zrlog库里面
mysql> use zrlog; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql>
3.查看表，有几个表
show tables; mysql> show tables; +-----------------+ | Tables_in_zrlog | +-----------------+ | comment | | link | | log | | lognav | | plugin | | tag | | type | | user | | website | +-----------------+ 9 rows in set (0.00 sec) mysql>
4.查看表有多少行，会看到website里面有9行数据
- select count(*) from website;
mysql> select count(*) from website; +----------+ | count(*) | +----------+ | 9 | +----------+ 1 row in set (0.00 sec) mysql>
5.这时候再来查看 从上 的zrlog表上的数据，会看到是同样的
6.将主机器上的 表作一个删除操做
- truncate table website;
- truncate 表示 清空
mysql> truncate table website; Query OK, 0 rows affected (0.04 sec)
7.再来查看 主机器 的表和 从机器 上表都会被删除了
主
mysql> select count(*) from website; +----------+ | count(*) | +----------+ | 0 | +----------+ 1 row in set (0.00 sec)
从
mysql> select count(*) from website; +----------+ | count(*) | +----------+ | 0 | +----------+ 1 row in set (0.00 sec)
- 如果误操做了，好比在从机器误删除了，再去主上删除相同的数据，就会有可能致使主从失败
- 这时在从机器上 start slave;
- 而后在start slave;
- 再来查看show slave status\G
- 如果仍是失败，则只能 从新作主从了
- 从新主从
- 在主机器的数据库上 show mater status; 查看文件大小
- 而后在从机器上先stop slave;
- 而后直接change master to master_host='192.168.202.130', master_user='repl', master_password='hanfeng', master_log_file='hf123.000001', master_log_pos=10549;
- 由于基本还没作什么操做的，数据仍是一致的，直接改下数据大小就行
- 而后在从机器上 start slave;
- 再来查看 show slave status\G 看是否为两个Yes
- 若实在只能从头作主从的
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